Malicious PDF — malware analysis report

Static analysis result for SHA-256 945dadd0e0e30898…

MALICIOUS

PDF

73.5 KB Created: 2021-09-27 12:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd0dcd7cc96d20b901a375df7a1ed288 SHA-1: aba11e128861a2cf241fedad7685df32c8c267bb SHA-256: 945dadd0e0e30898cce88d21972ca07cac041c6852d2136f09cbf8032a0c56be
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The presence of embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS upload storage, suggests an attempt to redirect users to malicious sites or host further payloads. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing or tech-support scam pattern, likely leveraging the embedded JavaScript to facilitate this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cfi-registration.org/buzzboxgift/img/userfiles/files/51390114924.pdf In PDF document text
    • https://capitalsyndic.com/userfiles/file/kavuximifupigizit.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/27284243097.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/28691401673.pdfIn PDF document text
    • http://citranco.com/users/files/41546986059.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/wodupokob.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/49693380622.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161480dc1154da---24752730272.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/jadipezeramumi.pdfIn PDF document text
    • https://bagstyle.uz/images/file/nedumegikaxiwidanu.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/buvuwomakolugowawufo.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/61514145313.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/10076548812.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/45704734666.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/12683175669.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/baxepesorubaf.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/65961088906.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d46e36dd99d509f91d1f47c42ca9e3fd/59088218741.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8caa6f3f1---67514550895.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/vedisizat.pdfIn PDF document text
    • http://ccsl.asia/files/soduzu.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/23971274503.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/xogojonupaporu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sema+thimiru+tamilPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD003 19452 bytes
SHA-256: 8cc630da1161e93b3273b3eb4d1dc52f0a05b69a78fa253b8a2c362e8100a06e
font_02_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 10156 bytes
SHA-256: a9a8ca93839ec55f7d3ee52c0c7b0b439bb3e23acd41b70cc41475be0a1ade16

Open this report in the interactive analyzer, or submit your own file for analysis.